OptimT v1.3.0

Updates:

• New module: PSO
• Add a single-objective standard PSO implementation, supporting both complie-time and run-time dimensional count, record and don't record fitness. Supports boosting using Eigen.
• Several chaotic devices ready for chaotic GA and chaotic PSO.
• Add functions to convert enumerations to strings.

Changes:

• GABase with recording is now a derived class from GABase without record.
• NSGA2 now uses hash checksum to examine whether the Pareto front has changed.